Originally Posted by davidn71
Honestly, you can do a mild port and polish job, just don't get carried away. The main thing is removing all the carbon build up. No fuel additive will do that for you, no matter what the can says...
what actually is the main thing is to not slow indutcion velocity. Many port jobs go wrong when people remove material in the wrong places. If you disrupt the velocity if the air flow to the point that flow is in a sense "too easy" you actually end up preventing proper intake...